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Diffstat (limited to 'sysdeps/mach/hurd/f_setlk.c')
-rw-r--r--sysdeps/mach/hurd/f_setlk.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/f_setlk.c b/sysdeps/mach/hurd/f_setlk.c
new file mode 100644
index 0000000000..6e1b308756
--- /dev/null
+++ b/sysdeps/mach/hurd/f_setlk.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 2014-2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sys/types.h>
+#include <sys/file.h>
+#include <fcntl.h>
+#include <errno.h>
+
+/* XXX
+ We need new RPCs to support POSIX.1 fcntl file locking!!
+ For the time being we support the whole-file case only,
+ with all kinds of WRONG WRONG WRONG semantics,
+ by using flock. This is definitely the Wrong Thing,
+ but it might be better than nothing (?). */
+int
+__f_setlk (int fd, int type, int whence, __off64_t start, __off64_t len, int wait)
+{
+ int cmd = 0;
+
+ switch (type)
+ {
+ case F_RDLCK: cmd |= LOCK_SH | __LOCK_ATOMIC; break;
+ case F_WRLCK: cmd |= LOCK_EX | __LOCK_ATOMIC; break;
+ case F_UNLCK: cmd = LOCK_UN; break;
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (wait == 0)
+ cmd |= LOCK_NB;
+
+ switch (whence)
+ {
+ case SEEK_SET:
+ if (start == 0 && len == 0) /* Whole file request. */
+ break;
+ /* It seems to be common for applications to lock the first
+ byte of the file when they are really doing whole-file locking.
+ So, since it's so wrong already, might as well do that too. */
+ if (start == 0 && len == 1)
+ break;
+ /* FALLTHROUGH */
+ case SEEK_CUR:
+ case SEEK_END:
+ errno = ENOTSUP;
+ return -1;
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+
+ return __flock (fd, cmd);
+}